Drill end sharpening means



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3 m l|nl|| n im w H HIL W a E.v C. KAPNlcK DRILL END SHARPENING MEANS March 31, 1953 2 SHEETS-SHEET 2 `Filed oct. 29, 1949- Ur/l/ Halo/er /n Genf/w( Pas/1700 INVENToR.

fda/afd CI-/fapn/c/r AWORNE YS in parallel relation to the shaft 3.

Patented Mar. 31 1953 'i L DRILL END SHAEPENING MEANS l v Edward o. Kapnick, Adrian, Mich. 1 Application october 29, 1949, serial No. 124,350

10 Claims. 1

This invention relates particularly to machines for grinding and sharpening cutting ends of drills.

The primary object of the invention is to .simplify and improve on the operation and construction of the drill end sharpening means described and claimed in my application for United `States Letters Patent filed January 28, 1949, Se-

rial No. 73,240. I

Further objects and advantages of the invention will be apparentfrom the following detailed description and from the accompanying drawings illustrating one embodiment of the invention, in which- Fig. 1 is a side elevation of a machine embodying the invention, with parts broken away, and with a drill held thereby in sharpening engagement with a grinding wheel; Fig. 2 is a different side elevation of the machine looking toward the face of the grinding wheel, and with parts broken away; Figs. 3 and 4 are enlarged sections,

respectively, on the lines 3--3 and 4-4 in Fig. A1; Figs. 5 and 6 are reduced sections on the line y-5 in Fig. 1, with the Work clamp in closed and open positions, respectively; Fig. 7 is a section .on the line 'I-I in Fig. 1; Fig. 8 is a similar section with the parts in dotted line position, and

Figs. 9, `and 11 are diagrammatical views 4showing different positions of a drill in relation ,to the grinding face of the grinding wheel.

Referring to the drawings, l designates the frame of a grinding machine that is mounted on f a base 2 and includes a power motor (not shown) having a shaft 3 projecting therefrom and carrying a grinding wheel 4 for rotation in a vertical plane and, in the present instance, presenting an annular working face4a at its outer side.

A shaft 5 is mounted in the base 2 below and This shaft is vfixed against axial an-d rotary movement and has one end projecting below the grinding wheel and carrying mechanism for holding a drill A in grinding relation to the wheel 4 and in which the present invention resides.

Mounted on the projecting end of the shaft 5 Ybelow the wheel 4 is a bearing bushing 6 that is keyed to the shaft to prevent turning and has a shoulder 1 at one end and a collar 3 threaded thereon at the other. A set-screw Ia prevents kaxial movements of the bushing 6 on the shaft. A bearing sleeve 9 is mounted for free rocking -movements on the bushing 6 between the .shoulder I and collar il` by which it is held against axial movements. The collar 8 is split to permit Yit tov be drawn into binding or locking relation to the bushing by a bolt or screw I0. The

shoulder 1 has a longitudinally disposed arm I I in the present instance of arcuate form, extending outwardly and upwardly from a side thereof and presenting a flat face at its inner side, or the side thereof adjacent to the shoulder axis. This face is parallel toa vertical plane longitudinal to and intersecting the axis of the shaft 5.

The sleeve 9 has a boss I2 projecting upward therefrom and formed with a cross opening I3 longitudinal to the shaft axis and this opening is longitudinally curved to receive and form a holder for a correspondingly curved Vslide-bar I4 the bow of which is downward. The boss I2 hasan eccentric ldmounted therein above the bar I4 and serving when turned to `either lock the bar against movement in the boss or to permit such movement. This eccentric has a lever arm I'I projecting therefrom. The arcs of the arm II and the bar I4 are concentric with an overhead center which preferably falls on Athe face 4a of the grinding wheel in substantially the horizontal plane of the wheel axis.

The holder 20 for a drill A beingsharpened is mounted on the outer end of the bar I4 and extends upward therefrom at the outer side of and in adjacent relation to the grinding wheel 4. This holder has a boss 2| extending downwardly from its lower inner edge portion and this boss has a stub shaft 22 projecting downward from its lower end through the bar I4 nearits outer end for rotary movements relative thereto with its axis radial to the arc of the bar. Theshaft carries washers 23 at each side of the bar` I4 and these are drawn to the bar by a nut 24 on the shaft. A cam 25 is mounted on the lower end of the shaft to turn therewith and bears at its 'periphery against the inner face of the arm- II so that when theshaft and holder are turned in one direction the cam acts against said arm to turn the holder and its carrying sleeve 9 in one direction from neutral, and when turned in the other direction will permit a turning of the holder and sleeve in the other direction from neutral, as indicated in dotted lines in Fig. 2'. A coiled contractile spring 26 connects the shoulder 'I and sleeve 9 and acts to normally .hold the face of the cam against the bar l I.

wheel.

of the drill. Each of these seats is provided in its top with aligned V-grooves for receiving the drill. The drill seat 30 is provided at its rear end with an adjusting screw stop 3I for the drill and at its forward end with a hinged clamp frame 32. This frame has a drill engaging jaw 33 (Figs. 5 and 6) that is inclined so as to have camming engagement with a -drill when clamped down thereon. The jaw 33 is slidable lengthwise in the frame 3.2 and is urged toward vthe ..vvorkfby a spring 34, the tension of which is adjusted by a screw 35. The jaw 33 is urged sidewise in the frame by a flat corrugated spring 36 in the side- A of the frame. The frame 32 is heldin clamped position by a pin 31 inserted into registering lapping portions 'of the parts 30 and 32." The toolseat 30 is held in adjusted positiononthe shou1-..v

der 28 by a suitable screw means' operated by a handle 38.

A front drill clamp 40 is attached to the holder adjacent to the drillA seat 29. This clamp comprises. a sleeve. 4I. axiallyand rotatably movable onastem 42. :and having afinger. 43. for project- Yforward end projected a Vdesired distance from .the former for engagement. with the grinding AdjustmentV ofthe stop screw 3i in engagement 4with the rear end of. vthe drill determines` the extent of projection of the end of the drill` beyond the. axial line of thev holder shaft 22. The bushing Gis adjusted axially onthe mountling.fshaft. 5 to properly position the drill holder assembly with respect to the face of the grinding wheel to cause theA drill end to be ground with thedesiredlip clearance, and the holder arc bar I4 is adjusted in the sleeve boss I2 to set the inclination of the drill axis to suit the angle at which thedrill end is to be ground. In the grinding operation, the operator grasps the holder and slowlyA swings it backward and forward about theinclined axis of the shaft 22, thus causing the camto turn in engagement with the stationary arm II, which in turn causes the holder assembly tovswing backward and forward on the bearingbushing jB .aided by the action of the spring ment is imparted to the drill end by which it. is

notonly rocked about the axis of the shaft 22 to. impart a rolling action to the conical drill end onv the-face of the grinding wheel, but is also rocked about the axis of the shaft 5 to swing thedrill.end,..during. its rolling action, across the face Vof the. wheel, as indicated by the diagram in Fig. 2. This avoids the forming of pits'and furrows in the wheel face soV that necessity of frequent dressing-'of the wheel surface is obviated. This .also `results Vin an arcuate grinding of the conical drill end and in the grinding of a keener and more uniform cutting edge on the work. When one arc on the conical end surface ofthe. drill has been ground, the drill is rotatably shifted in theA holder to bring successive arcs into grinding fposition, and the grinding operation is: repeated for-each such adjustment.v

During the end sharpening of a drill, the washers 23 are intended to engage the arcuate bar I4 with suii'icient freeness to permit oscillating movements of the holder 2D relative to said bar. For the purpose of dressing the grinding wheel, the holder shaft 22 may be locked against turning on the bar I4 by tightening the nut 24, and a conventional dressing diamond may be substituted for a drill on the holder 20. The holder 320 Vmay then be swung backward and forward about the axis of the shaft 5 to move the dressing diamond across the face of the wheel. Such a locking of the holder 20 on the bar I4 also permits the grinding of reamers.

I wish it understood that my invention is not limited to. any specific construction, arrangement or form of the parts, as it is capable of numerous modifications `and i' changes without departing from1the spirit of the claims.

Having thus described my invention, what I claim `as new, and desire to secure by United States Letters Patent, is:

l. In a tool grinding machine of the class described havinga rotatable grinding wheel with a radial grinding face, a mounting means, a member on said means rockable about an axis transverse to the plane of the grinding face of the wheel, means for holding a tool with its end in grinding position, said last means being carried by said Vmember for rocking. movements about an axis in angular relation to said first axis. which .is angled to the tool axis, whereby a rocking of the tool holding means will cause the tool end to have rolling coaction with the wheel, and cam means connecting said mounting means and holding means and operable to rock said member and tool holding means on the mounting means when the tool holding means is rocked on its axis, whereby the point of contact of the tool With the Wheel is arcuately shifted across the wheel face.`

2. In a machine of the class described having a grinding wheel with a radial grinding face, together with a shaft, means for mounting the shaft at a side of the periphery of said Wheel in parallel relation to its axis, a member rockable on said shaft, biasing means for urging a rocking movement of the member in one direction, arcuate means carried by said member for longitudinal adjustment axially of the member and with its concaved side facing the wheel, means for holding a tool in inclined relation to the grinding face of said wheel with its end in grinding engagement therewith, said last means being mounted on said arcuate means for adjusting movements therewith to vary the inclination of a held tool to the wheel axis and having pivotal connection with said arcuate means for relative rocking movements about an axis substantially radial to the arc of the arcuate means with such axis intersecting the tool adjacent to the grinding facing of the wheel, and means having cooperating parts one rockable with said holding means and another fixed relative to said shaft and operable by rocking movements` of the holding means in one direction to impart rocking movements to said member against said biasing means and by rocking movements of the holding means inthe opposite direction to permit biasing means actuated movements of said member.

3. A combination as called for in claim-2 wherein said cooperating `partsv comprise a cam attached to and rockable with the holding means 'and a'xed projecting portion ony the shaft.

aesaoss 4. A combination as called for in claim 3, together with means to lock said tool holding means to said arcuate means to prevent relative turning thereof.

5. In a drill grinding machine having a grinding Wheel with a radial grinding face, means for holding a drill in end grinding engagement with said face of the wheel With its axis inclined to the coacting grinding face, means mounting said holding means for rocking movements about two relatively angled axes with one intersecting a drill being ground adjacent to the point of grinding and with the other axis substantially parallel to the Wheel axis, means automatically operable to rock the holding means about one axis When it is rocked about the other axis, and means for locking said first means against rocking movements on said intersecting axis.

6. In a machine of the class described, having a grinding Wheel With a radial grinding face, a mounting member, means mounted for rocking movements on said member at a side of the grinding Wheel periphery with its rocking axis substantially parallel to the Wheel axis, biasing means to rock said means in one direction, a tool holder carried by said means in position to hold a tool and in grinding relation to the grinding face of the Wheel with its axis inclined to the wheel axis, means for varying the inclination of the tool axis, said tool holder being rockable relative to said i'lrst means about an axis angularly disposed to the rocking axis of such rst means, and means having parts carried, respectively, by said mounting member and tool holder and operable to cooperate to impart predetermined rocking movements to the first means and tool holder about the rocking axis of the irst means When the tool holder is rocked about its rocking axis.

7. In a machine of the class described having a grinding Wheel with a radial grinding face, a fixed shaft substantially parallel to the grinding wheel axis, a collar mounted for limited rocking movements on said shaft, biasing means to rock said collar in one direction on the shaft, a member in xed relation to said shaft, a mount carried by said collar for movements therewith, a tool holder carried by said mount in position to hold a tool end in grinding relation to the grinding face of said Wheel with its axis inclined to the wheel axis, said tool holder being rockable on said mount about an axis angularly disposed to the axis of said shaft, and means rockable with said tool holder about its rocking axis and When rocked in one direction cooperating with said member to rock said tool holder and collar on said shaft against the action of said biasing means.

8. A combination vas called for in claim 7, together with means connecting said collar and mount and shiftable to vary the angle of the tool holder rocking axis to the collar axis.

9. In a tool grinding machine having a grinding wheel with a radial grinding face, means for holding a tool with its cutting end in engagement with said face of the Wheel, a mount carrying said tool holding means for rocking movements about an axis intersecting the tool near its cutting end, means carrying said mount for rocking movements on an axis that is angled With respect to said i'lrst rocking axis, means connecting said last means and tool holding means and operable to impart predetermined rocking movements to the mount When the tool holding means is rocked, and means for transversely shifting the rocking axis of said holding means relative to the mount to change the angular relation of the tool to the Wheel.

10. In a machine of the class described having a grinding Wheel with a radial grinding face, a member mounted for rocking movements at one side of the grinding Wheel periphery with its rocking axis substantially parallel to the Wheel axis, a mount for said member, biasing means to rock said member in one direction, a tool holder carried by said member in position to hold a tool end in grinding relation to the grinding face of the Wheel with. its axis inclined tothe Wheel axis, means for varying the inclination of the tool axis, said tool holder being roclrable relative to said member about an axis angularly disposed to the rocking axis of the member, means having parts carried, respectively, by said tool holder and mount and operable to cooperate to impart predetermined rocking movements to the member and tool holder about the rocking axis of the member when the tool holder is rocked about its angularly disposed axis, and means for locking said tool holder against rocking movements on said angularly disposed axis.

EDWARD C. KAPNICK.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 153,401 Van Haagen July 21, 1874 411,845 Walker Oct. l, 1889 497,095 Hall May 9, 1893 523,897 Kenyon July 31, 1894 571,336 Budlong Nov. 17, 1896 584,114 Hill June 8, 1897 611,323 Johnston Sept. 27, 1898 614,092 Eames Nov. 15, 1898 643,703 White Feb. 20, 1900 707,549 Chandler Aug. 26, 1902 821,849 Benicke May 29, 1906 1,481,260 I-Iemenway Jan. 22, 1924 2,098,267 Weishampel Nov. 9, 1937 2,142,923 Stocking Jan. 3, 1939 2,144,095 Zwick Jan. 17, 1939 2,202,587 Kitchen May 28, 1940 2,328,549 Eich et al Sept. 7, 1943 2,486,335 Smith et al Oct. 25, 1949 2,498,701 Munro Feb. 28, 1950 

